Table 2 Univariate analysis: the candidate risk factors of intra-operative bleeding

Maternal age (years)^a

32.3 ± 4.8

31.8 ± 5.2

Gravidity^b

4 (2-10)

4 (1-11)

Parity^b

1 (1-2)

1 (1-3)

Number of prior CS^b

1 (1-2)

1 (1-3)

Interval between CS and CSP (years)^a

6.1 ± 4.4

5.7 ± 3.9

Recurrent CSP (number, %)^c

3 (9.4%)

8 (2.8%)

Fetal heart beat (number, %)^c

7 (21.9%)

105 (37.2%)

β-hCG level (*10^5mIU/mL)^a

7.01 ± 6.61

5.64 ± 6.96

Gestational age (days)^a

58.4 ± 14.9

50.5 ± 10.1

Maximum diameter of CSP mass (cm)^a

4.6 ± 2.3

3.0 ± 1.4

Median diameter of CSP mass (cm)^a

3.7 ± 1.8

2.3 ± 1.2

Minimum diameter of CSP mass (cm)^a

2.9 ± 1.7

1.8 ± 1.1

Myometrial thickness (cm)^a

0.03 ± 0.06

0.12 ± 0.08

Rich blood supply (number, %)^c

12 (37.5%)

44 (15.6%)

 Type I (number, %)^c

19 (53.4%)

244 (86.5%)

 Type II (number, %)^c

13 (40.6%)

38 (13.5%)

Interval between UAE and curettage (hours)^#

72 (24-168)

48 (12-168)